It ORBS/SAD, but that's another story ...
Er, it's any / all of; ORBI, ORBS, SDA & used to be BGW.
SAD is Safford, AZ [Safford Municipal Airport], USA
The daily B1900, operated by a UAE carrier, is on behalf of FedEx.
A FECA B1900 did used to operate daily but hasn't been here for a while. Air-Serv have usually a couple of flights a day with B1900Ds.